Means for stopping railway-trains at danger-signals.



N0. 757,711. PATENTED-APR. 19, 1904; WQL. ADAMSON. MEANS FORSI'OPPING RAILWAY TRAINS AT I ANGER SIGNALS. APPLICATION rum) mum. 1903. 10 MODEL Evy fness cs.

UNITED STATES meme April 19, 1904.

PATENT OFFICE.

MEANS FOR STOPPING RAILWAY-TRAINS AT DANGER-SIGNALS.

SPECIFICATION formingpart of Letters Patent No. 757,711, dated April 19, 1904.

Application filed June 8, 1903. Seria1N0- 160,553. (N0 model.)

connected mechanism to set the air-brakes.

and stop the locomotive and the train to prevent their passage by the signal in case from any cause the engineer shall fail to observe the signal, and thereby eliminate the risk of rear-end collisions with preceding trains which may have passed the signals and which are running at less speed or which have made a stop' within the block.

The invention is illustrated in the accompanying drawings, in which like parts are designated by similar reference characters, and.

in which Figure 1 is a side elevation of a portion of a locomotive and a signal. Fig. 2 is a semifront elevation of a locomotive, the cross-section of the track, and the signal. Fig. 3 is a cross-section of the brake-valve closed as before the operation of the signal. Fig. 4 is a cross-section of the brake-valve open as done by the signal.

The signal-tower 1 maybe any ofthe preferred forms, operated by pneumatic, hydrostatic, or other power which employs a cylinder 2, with a piston 3, operating a rod 4, which raises and lowers the signal 5. Attached to the rod 4 is a gear-rack 6, engagmg a pinion 7, secured to the shaft 8, which passes within the track, is secured in a bearing 9, and carries an arm 10, adapted to swlng to a vertical position reaching above the rails when the piston moves therack up,

as when the signal is set, and to move to a level position below the rails as the piston moves the rack down when dropping the signal. As seen in Figs. 1, 2, the signal is set or up. The train-pipe 11 of the locomotive has a pipe 12 thereto connected, which carries a brake-valve (shown in detail in Figs. 3, L) and comprises a case 13, with an opening 14 at one side. IVithin the case is the valve 15, having a hollow'center 16, with a part 17 of its outer surface cut away, so that the passage from pipe 12 to its center is always open; but when the arm 18, which is attached to the valve, abuts the arm 10, as it will do when the signal is set, arm 10 will assume the position shown in Fig. 4, when air will escape through opening 14 and the brakes will be set. An arm 19 of the valve is engaged by spring 20 to hold the valve in its normal closed position.

In a train-stopping device, a signal opera tive by power applied to a piston, a rod from the piston, a rack upon the rod. a pinion engaging the rack and operating a shaft having an arm at its opposite end adapted to move to vertical and horizontal positions, and a valve located in communication with a train-pipe, having means to abut the arm aforesaid when it is placed in a vertical position and thereby open the valve and the train-pipe.

. In testimony whereof I aflix' my signature in presence of two witnesses.

WILLIAM L. ADAMSON.

Witnesses:

RANSOM C. WRIGHT, WILLIAM (J. S'roEvER. 

